cve-2022-48845
Vulnerability from cvelistv5
Published
2024-07-16 12:25
Modified
2024-12-19 08:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: MIPS: smp: fill in sibling and core maps earlier After enabling CONFIG_SCHED_CORE (landed during 5.14 cycle), 2-core 2-thread-per-core interAptiv (CPS-driven) started emitting the following: [ 0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi)) [ 0.048183] ------------[ cut here ]------------ [ 0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240 [ 0.048220] Modules linked in: [ 0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f [ 0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1 [ 0.048278] 830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000 [ 0.048307] 00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000 [ 0.048334] 00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34 [ 0.048361] 817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933 [ 0.048389] ... [ 0.048396] Call Trace: [ 0.048399] [<8105a7bc>] show_stack+0x3c/0x140 [ 0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80 [ 0.048440] [<8108b5c0>] __warn+0xc0/0xf4 [ 0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c [ 0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240 [ 0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80 [ 0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140 [ 0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140 [ 0.048523] [<8106593c>] start_secondary+0xbc/0x280 [ 0.048539] [ 0.048543] ---[ end trace 0000000000000000 ]--- [ 0.048636] Synchronize counters for CPU 1: done. ...for each but CPU 0/boot. Basic debug printks right before the mentioned line say: [ 0.048170] CPU: 1, smt_mask: So smt_mask, which is sibling mask obviously, is empty when entering the function. This is critical, as sched_core_cpu_starting() calculates core-scheduling parameters only once per CPU start, and it's crucial to have all the parameters filled in at that moment (at least it uses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` on MIPS). A bit of debugging led me to that set_cpu_sibling_map() performing the actual map calculation, was being invocated after notify_cpu_start(), and exactly the latter function starts CPU HP callback round (sched_core_cpu_starting() is basically a CPU HP callback). While the flow is same on ARM64 (maps after the notifier, although before calling set_cpu_online()), x86 started calculating sibling maps earlier than starting the CPU HP callbacks in Linux 4.14 (see [0] for the reference). Neither me nor my brief tests couldn't find any potential caveats in calculating the maps right after performing delay calibration, but the WARN splat is now gone. The very same debug prints now yield exactly what I expected from them: [ 0.048433] CPU: 1, smt_mask: 0-1 [0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32813321f18d5432cec1b1a6ecc964f9ea26d565Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/56eaacb8137ba2071ce48d4e3d91979270e139a7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7315f8538db009605ffba00370678142ef00ac98Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/94647aec80d03d6914aa664b7b8e103cd9d63239Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be538b764a46be1d0700fd3b6e82fb76bd17f13aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2420bc3333111184cdcb112282d13afe1338dd7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8ad9ecc406974deb5e7c070f51cc1d09d21dc4bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f2703def339c793674010cc9f01bfe4980231808Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/32813321f18d5432cec1b1a6ecc964f9ea26d565Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/56eaacb8137ba2071ce48d4e3d91979270e139a7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7315f8538db009605ffba00370678142ef00ac98Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/94647aec80d03d6914aa664b7b8e103cd9d63239Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/be538b764a46be1d0700fd3b6e82fb76bd17f13aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c2420bc3333111184cdcb112282d13afe1338dd7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e8ad9ecc406974deb5e7c070f51cc1d09d21dc4bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f2703def339c793674010cc9f01bfe4980231808Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: smp: fill in sibling and core maps earlier\n\nAfter enabling CONFIG_SCHED_CORE (landed during 5.14 cycle),\n2-core 2-thread-per-core interAptiv (CPS-driven) started emitting\nthe following:\n\n[    0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi))\n[    0.048183] ------------[ cut here ]------------\n[    0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240\n[    0.048220] Modules linked in:\n[    0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f\n[    0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1\n[    0.048278]         830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000\n[    0.048307]         00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000\n[    0.048334]         00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34\n[    0.048361]         817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933\n[    0.048389]         ...\n[    0.048396] Call Trace:\n[    0.048399] [<8105a7bc>] show_stack+0x3c/0x140\n[    0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80\n[    0.048440] [<8108b5c0>] __warn+0xc0/0xf4\n[    0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c\n[    0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240\n[    0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80\n[    0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140\n[    0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140\n[    0.048523] [<8106593c>] start_secondary+0xbc/0x280\n[    0.048539]\n[    0.048543] ---[ end trace 0000000000000000 ]---\n[    0.048636] Synchronize counters for CPU 1: done.\n\n...for each but CPU 0/boot.\nBasic debug printks right before the mentioned line say:\n\n[    0.048170] CPU: 1, smt_mask:\n\nSo smt_mask, which is sibling mask obviously, is empty when entering\nthe function.\nThis is critical, as sched_core_cpu_starting() calculates\ncore-scheduling parameters only once per CPU start, and it's crucial\nto have all the parameters filled in at that moment (at least it\nuses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` on\nMIPS).\n\nA bit of debugging led me to that set_cpu_sibling_map() performing\nthe actual map calculation, was being invocated after\nnotify_cpu_start(), and exactly the latter function starts CPU HP\ncallback round (sched_core_cpu_starting() is basically a CPU HP\ncallback).\nWhile the flow is same on ARM64 (maps after the notifier, although\nbefore calling set_cpu_online()), x86 started calculating sibling\nmaps earlier than starting the CPU HP callbacks in Linux 4.14 (see\n[0] for the reference). Neither me nor my brief tests couldn't find\nany potential caveats in calculating the maps right after performing\ndelay calibration, but the WARN splat is now gone.\nThe very same debug prints now yield exactly what I expected from\nthem:\n\n[    0.048433] CPU: 1, smt_mask: 0-1\n\n[0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef",
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      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2022-48845",
      datePublished: "2024-07-16T12:25:14.489Z",
      dateReserved: "2024-07-16T11:38:08.911Z",
      dateUpdated: "2024-12-19T08:08:50.557Z",
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   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2022-48845\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-16T13:15:11.803\",\"lastModified\":\"2024-11-21T07:34:11.920\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nMIPS: smp: fill in sibling and core maps earlier\\n\\nAfter enabling CONFIG_SCHED_CORE (landed during 5.14 cycle),\\n2-core 2-thread-per-core interAptiv (CPS-driven) started emitting\\nthe following:\\n\\n[    0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi))\\n[    0.048183] ------------[ cut here ]------------\\n[    0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240\\n[    0.048220] Modules linked in:\\n[    0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f\\n[    0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1\\n[    0.048278]         830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000\\n[    0.048307]         00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000\\n[    0.048334]         00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34\\n[    0.048361]         817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933\\n[    0.048389]         ...\\n[    0.048396] Call Trace:\\n[    0.048399] [<8105a7bc>] show_stack+0x3c/0x140\\n[    0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80\\n[    0.048440] [<8108b5c0>] __warn+0xc0/0xf4\\n[    0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c\\n[    0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240\\n[    0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80\\n[    0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140\\n[    0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140\\n[    0.048523] [<8106593c>] start_secondary+0xbc/0x280\\n[    0.048539]\\n[    0.048543] ---[ end trace 0000000000000000 ]---\\n[    0.048636] Synchronize counters for CPU 1: done.\\n\\n...for each but CPU 0/boot.\\nBasic debug printks right before the mentioned line say:\\n\\n[    0.048170] CPU: 1, smt_mask:\\n\\nSo smt_mask, which is sibling mask obviously, is empty when entering\\nthe function.\\nThis is critical, as sched_core_cpu_starting() calculates\\ncore-scheduling parameters only once per CPU start, and it's crucial\\nto have all the parameters filled in at that moment (at least it\\nuses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` on\\nMIPS).\\n\\nA bit of debugging led me to that set_cpu_sibling_map() performing\\nthe actual map calculation, was being invocated after\\nnotify_cpu_start(), and exactly the latter function starts CPU HP\\ncallback round (sched_core_cpu_starting() is basically a CPU HP\\ncallback).\\nWhile the flow is same on ARM64 (maps after the notifier, although\\nbefore calling set_cpu_online()), x86 started calculating sibling\\nmaps earlier than starting the CPU HP callbacks in Linux 4.14 (see\\n[0] for the reference). Neither me nor my brief tests couldn't find\\nany potential caveats in calculating the maps right after performing\\ndelay calibration, but the WARN splat is now gone.\\nThe very same debug prints now yield exactly what I expected from\\nthem:\\n\\n[    0.048433] CPU: 1, smt_mask: 0-1\\n\\n[0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvió la siguiente vulnerabilidad: MIPS: smp: complete los mapas de hermanos y núcleos antes Después de habilitar CONFIG_SCHED_CORE (aterrizado durante el ciclo 5.14), se inició interAptiv de 2 núcleos y 2 subprocesos por núcleo (controlado por CPS) emitiendo lo siguiente: [0.025698] La revisión de CPU1 es: 0001a120 (MIPS interAptiv (multi)) [0.048183] ------------[ cortar aquí ]------------ [0.048187] ADVERTENCIA: CPU: 1 PID: 0 en kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240 [0.048220] Módulos vinculados en: [0.048233] CPU: 1 PID: 0 Comm: swapper/1 No contaminado 5.17 .0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f [0.048247] Pila: 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1 [ 0.048278] 830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000 [ 0.048307] 00000000 00000000 815fcbc 4 00000000 00000000 00000000 00000000 00000000 [ 0,048334] 00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34 [ 0.048361] 817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933 [ 0.048389] ... 0.048396] Seguimiento de llamadas: [ 0.048399] [&lt;8105a7bc&gt;] show_stack+0x3c/0x140 [ 0.048424] [&lt;8131c2a0&gt;] dump_stack_lvl+0x60 /0x80 [ 0.048440] [&lt;8108b5c0&gt;] __warn+0xc0/0xf4 [ 0.048454] [&lt;8108b658&gt;] warn_slowpath_fmt+0x64/0x10c [ 0.048467] [&lt;810bd418&gt;] 198/0x240 [ 0.048483] [&lt;810c6514&gt;] sched_cpu_starting +0x14/0x80 [ 0.048497] [&lt;8108c0f8&gt;] cpuhp_invoke_callback_range+0x78/0x140 [ 0.048510] [&lt;8108d914&gt;] notify_cpu_starting+0x94/0x140 [ 0.048523] [&lt;8106593c&gt;] _secundario+0xbc/0x280 [ 0,048539] [ 0,048543] - --[ end trace 0000000000000000 ]--- [ 0.048636] Sincronizar contadores para CPU 1: hecho. ...para cada uno menos CPU 0/arranque. Las impresiones de depuración básicas justo antes de la línea mencionada dicen: [0.048170] CPU: 1, smt_mask: Entonces smt_mask, que obviamente es una máscara hermana, está vacía al ingresar a la función. Esto es crítico, ya que sched_core_cpu_starting() calcula los parámetros de programación central solo una vez por inicio de CPU, y es crucial tener todos los parámetros completados en ese momento (al menos usa cpu_smt_mask() que de hecho es `&amp;cpu_sibling_map[cpu]` en MIPS). Un poco de depuración me llevó a que set_cpu_sibling_map() realizaba el cálculo del mapa real, se invocaba después de notify_cpu_start(), y exactamente la última función inicia la ronda de devolución de llamada de CPU HP (sched_core_cpu_starting() es básicamente una devolución de llamada de CPU HP). Si bien el flujo es el mismo en ARM64 (mapas después del notificador, aunque antes de llamar a set_cpu_online()), x86 comenzó a calcular mapas de hermanos antes de iniciar las devoluciones de llamada de CPU HP en Linux 4.14 (consulte [0] para la referencia). Ni yo ni mis breves pruebas pudimos encontrar posibles advertencias al calcular los mapas justo después de realizar la calibración de retraso, pero el símbolo WARN ya no está. Las mismas impresiones de depuración ahora producen exactamente lo que esperaba de ellas: [0.048433] CPU: 1, smt_mask: 0-1 [0] https://git.kernel.org/pub/scm/linux/kernel/git/mips /linux.git/commit/?id=76ce7cfe35ef\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.9.308\",\"matchCriteriaId\":\"0B50CF0F-1EB6-46C4-AFBA-C5492AC849BD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"4.14.273\",\"matchCriteriaId\":\"A1E9CE4F-B0EA-4F88-9562-4F113E598085\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.236\",\"matchCriteriaId\":\"09979837-E01F-4E28-B943-9F680CA3D278\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.186\",\"matchCriteriaId\":\"F5FC3779-EA15-49D0-A021-B9224F651B97\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.107\",\"matchCriteriaId\":\"295C9D5D-520B-4D0F-A53A-7C514F05B3D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.30\",\"matchCriteriaId\":\"F1745C4F-8278-4F2E-9239-53C59154A03D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.16\",\"matchCriteriaId\":\"EDF25425-C006-411E-B842-0F12075B8C13\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/32813321f18d5432cec1b1a6ecc964f9ea26d565\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/56eaacb8137ba2071ce48d4e3d91979270e139a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7315f8538db009605ffba00370678142ef00ac98\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/94647aec80d03d6914aa664b7b8e103cd9d63239\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/be538b764a46be1d0700fd3b6e82fb76bd17f13a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c2420bc3333111184cdcb112282d13afe1338dd7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e8ad9ecc406974deb5e7c070f51cc1d09d21dc4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f2703def339c793674010cc9f01bfe4980231808\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/32813321f18d5432cec1b1a6ecc964f9ea26d565\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/56eaacb8137ba2071ce48d4e3d91979270e139a7\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7315f8538db009605ffba00370678142ef00ac98\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/94647aec80d03d6914aa664b7b8e103cd9d63239\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/be538b764a46be1d0700fd3b6e82fb76bd17f13a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c2420bc3333111184cdcb112282d13afe1338dd7\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e8ad9ecc406974deb5e7c070f51cc1d09d21dc4b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f2703def339c793674010cc9f01bfe4980231808\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7315f8538db009605ffba00370678142ef00ac98\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/32813321f18d5432cec1b1a6ecc964f9ea26d565\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/56eaacb8137ba2071ce48d4e3d91979270e139a7\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c2420bc3333111184cdcb112282d13afe1338dd7\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/e8ad9ecc406974deb5e7c070f51cc1d09d21dc4b\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/be538b764a46be1d0700fd3b6e82fb76bd17f13a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/94647aec80d03d6914aa664b7b8e103cd9d63239\", \"tags\": [\"x_transferred\"]}, {\"url\": 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\"bippy-9e1c9544281a\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nMIPS: smp: fill in sibling and core maps earlier\\n\\nAfter enabling CONFIG_SCHED_CORE (landed during 5.14 cycle),\\n2-core 2-thread-per-core interAptiv (CPS-driven) started emitting\\nthe following:\\n\\n[    0.025698] CPU1 revision is: 0001a120 (MIPS interAptiv (multi))\\n[    0.048183] ------------[ cut here ]------------\\n[    0.048187] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:6025 sched_core_cpu_starting+0x198/0x240\\n[    0.048220] Modules linked in:\\n[    0.048233] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3+ #35 b7b319f24073fd9a3c2aa7ad15fb7993eec0b26f\\n[    0.048247] Stack : 817f0000 00000004 327804c8 810eb050 00000000 00000004 00000000 c314fdd1\\n[    0.048278]         830cbd64 819c0000 81800000 817f0000 83070bf4 00000001 830cbd08 00000000\\n[    0.048307]         00000000 00000000 815fcbc4 00000000 00000000 00000000 00000000 00000000\\n[    0.048334]         00000000 00000000 00000000 00000000 817f0000 00000000 00000000 817f6f34\\n[    0.048361]         817f0000 818a3c00 817f0000 00000004 00000000 00000000 4dc33260 0018c933\\n[    0.048389]         ...\\n[    0.048396] Call Trace:\\n[    0.048399] [<8105a7bc>] show_stack+0x3c/0x140\\n[    0.048424] [<8131c2a0>] dump_stack_lvl+0x60/0x80\\n[    0.048440] [<8108b5c0>] __warn+0xc0/0xf4\\n[    0.048454] [<8108b658>] warn_slowpath_fmt+0x64/0x10c\\n[    0.048467] [<810bd418>] sched_core_cpu_starting+0x198/0x240\\n[    0.048483] [<810c6514>] sched_cpu_starting+0x14/0x80\\n[    0.048497] [<8108c0f8>] cpuhp_invoke_callback_range+0x78/0x140\\n[    0.048510] [<8108d914>] notify_cpu_starting+0x94/0x140\\n[    0.048523] [<8106593c>] start_secondary+0xbc/0x280\\n[    0.048539]\\n[    0.048543] ---[ end trace 0000000000000000 ]---\\n[    0.048636] Synchronize counters for CPU 1: done.\\n\\n...for each but CPU 0/boot.\\nBasic debug printks right before the mentioned line say:\\n\\n[    0.048170] CPU: 1, smt_mask:\\n\\nSo smt_mask, which is sibling mask obviously, is empty when entering\\nthe function.\\nThis is critical, as sched_core_cpu_starting() calculates\\ncore-scheduling parameters only once per CPU start, and it's crucial\\nto have all the parameters filled in at that moment (at least it\\nuses cpu_smt_mask() which in fact is `&cpu_sibling_map[cpu]` on\\nMIPS).\\n\\nA bit of debugging led me to that set_cpu_sibling_map() performing\\nthe actual map calculation, was being invocated after\\nnotify_cpu_start(), and exactly the latter function starts CPU HP\\ncallback round (sched_core_cpu_starting() is basically a CPU HP\\ncallback).\\nWhile the flow is same on ARM64 (maps after the notifier, although\\nbefore calling set_cpu_online()), x86 started calculating sibling\\nmaps earlier than starting the CPU HP callbacks in Linux 4.14 (see\\n[0] for the reference). Neither me nor my brief tests couldn't find\\nany potential caveats in calculating the maps right after performing\\ndelay calibration, but the WARN splat is now gone.\\nThe very same debug prints now yield exactly what I expected from\\nthem:\\n\\n[    0.048433] CPU: 1, smt_mask: 0-1\\n\\n[0] https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git/commit/?id=76ce7cfe35ef\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:17:42.268Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2022-48845\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T12:17:42.268Z\", \"dateReserved\": \"2024-07-16T11:38:08.911Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-16T12:25:14.489Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.